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By Philimon Bulawayo VICTORIA FALLS, Zimbabwe (Reuters) - Zimbabwe's President Robert Mugabe celebrated his 91st birthday with a lavish party by the spectacular Victoria Falls on Saturday, prompting many Zimbabweans to question once again when he would leave office and who would succeed him. Thousands of supporters were expected to attend the $1 million birthday celebration on a golf course near the waterfalls, organised by his ZANU-PF party. He is one of a handful of African leaders remaining from a generation that fought white domination, which included South Africa's Nelson Mandela. On Friday night Mugabe told state television in an interview, the final of a two-part series, that he would not annoint a successor to take over ruling the ZANU-PF party.